Released in 2006, happens to belong to N series family of the Nokia corp. featuring a 2Megapixel camera and 4 GB card that can store a maximum of 3000 songs in a wide range of formaats like AAC, AAC+, eAAC+, MP3, MIDI, WAV. The phone has dedicated buttons for music shortcut keys and the same can be used for navigation too.
The phone features a symbian series 60, new version OS. In the adverts for the phone it 3.5mm input jackplug. N91 also comes with a fully equipped browser. The normal alphanumeric keypad can be found if the user slide opens the screen.